Gerd Bouma1, Anjali Kaushiva, Warren Strober. 1. Mucosal Immunity Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
Abstract
BACKGROUND & AIMS: Immunogenetic analysis of experimental colitis may contribute to the further unraveling of the complex genetic basis of the inflammatory bowel diseases, Crohn's disease and ulcerative colitis. METHODS: Genetic regions associated with susceptibility to trinitrobenzene sulfonic acid (TNBS)-induced colitis were identified in a genome-wide linkage analysis in F2 progeny of colitis-susceptible SJL/J and -resistant C57BL/6 mice. An immunogenetic approach was then used to further study the pathophysiologic role of one of the identified loci. RESULTS: We identified susceptibility loci on chromosomes 9 (Tnbs1) and 11 (Tnbs2). Tnbs2 harbors the interleukin (IL)-12 p40 gene, a likely candidate gene because IL-12 is a known central mediator for both experimental colitis and human Crohn's disease. We therefore tested the ability of colitis-susceptible and -resistant strains to mount IL-12 responses to lipopolysaccharide (LPS), a strong inducer of IL-12 that is abundantly present in the intestine. We observed a remarkably higher serum IL-12 response to LPS in susceptible SJL/J mice. Subsequently, we showed that the genetic region regulating the IL-12 response to LPS colocalizes with Tnbs2. CONCLUSIONS: These data strongly suggest that the tendency to mount a high LPS-induced IL-12 response and susceptibility to TNBS-induced colitis are related and that in fact a genetically determined high IL-12 response is involved in the immunologic basis of susceptibility to colitis.
BACKGROUND & AIMS: Immunogenetic analysis of experimental colitis may contribute to the further unraveling of the complex genetic basis of the inflammatory bowel diseases, Crohn's disease and ulcerative colitis. METHODS: Genetic regions associated with susceptibility to trinitrobenzene sulfonic acid (TNBS)-induced colitis were identified in a genome-wide linkage analysis in F2 progeny of colitis-susceptible SJL/J and -resistant C57BL/6 mice. An immunogenetic approach was then used to further study the pathophysiologic role of one of the identified loci. RESULTS: We identified susceptibility loci on chromosomes 9 (Tnbs1) and 11 (Tnbs2). Tnbs2 harbors the interleukin (IL)-12 p40 gene, a likely candidate gene because IL-12 is a known central mediator for both experimental colitis and humanCrohn's disease. We therefore tested the ability of colitis-susceptible and -resistant strains to mount IL-12 responses to lipopolysaccharide (LPS), a strong inducer of IL-12 that is abundantly present in the intestine. We observed a remarkably higher serum IL-12 response to LPS in susceptible SJL/J mice. Subsequently, we showed that the genetic region regulating the IL-12 response to LPS colocalizes with Tnbs2. CONCLUSIONS: These data strongly suggest that the tendency to mount a high LPS-induced IL-12 response and susceptibility to TNBS-induced colitis are related and that in fact a genetically determined high IL-12 response is involved in the immunologic basis of susceptibility to colitis.
Authors: Andrew E Hillhouse; Matthew H Myles; Jeremy F Taylor; Elizabeth C Bryda; Craig L Franklin Journal: Mamm Genome Date: 2011-06-30 Impact factor: 2.957
Authors: Claire Billerey-Larmonier; Jennifer K Uno; Nicolas Larmonier; Anna J Midura; Barbara Timmermann; Fayez K Ghishan; Pawel R Kiela Journal: Inflamm Bowel Dis Date: 2008-06 Impact factor: 5.325
Authors: Kanneboyina Nagaraju; Rashmi Rawat; Edina Veszelovszky; Rachana Thapliyal; Akanchha Kesari; Susan Sparks; Nina Raben; Paul Plotz; Eric P Hoffman Journal: Am J Pathol Date: 2008-02-14 Impact factor: 4.307